Improves reconnection responsiveness. #516

Job	Run time
B2 msvc-14.2	5m 19s
B2 gcc-11	3m 35s
B2 msvc-14.3	4m 33s
CMake gcc-11 17 Debug	9m 21s
B2 clang-14	3m 40s
CMake gcc-11 20 Release	12m 10s
CMake msvc-14.2 Debug C++17	7m 30s
CMake clang-11 17 Debug	6m 3s
CMake msvc-14.2 Release C++17	7m 35s
CMake clang-11 20 Debug	6m 49s
CMake msvc-14.3 Debug C++20	7m 28s
CMake clang-13 17 Release	9m 34s
CMake msvc-14.3 Release C++20	6m 33s
CMake clang-13 20 Release	9m 48s
CMake clang-14 17 Debug -stdlib=libc++	8m 10s
CMake clang-14 20 Release -stdlib=libc++	12m 24s
	2h 0m 32s

Provide feedback